test_channel.py

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import lsst.gauss2d.fit as g2f
 
import pytest
 
 
def test_channel():
    # Previous tests may have added channels
    # Ideally we'd clean up but it is more difficult to ensure fixtures remove
    # all channels and uses thereof than to just accept that some may exist
    channels_all = g2f.Channel.all
    n_channels = len(channels_all)
    assert n_channels >= 1
 
    with pytest.raises(ValueError):
        # The None channel is special and accessed as g2f.Channel.NONE
        g2f.Channel("None")
 
    name_new = "A long name that is very unlikely to have already been taken"
    channel_new = g2f.Channel(name_new)
    assert len(g2f.Channel.all) == (n_channels + 1)
    with pytest.raises(ValueError):
        g2f.Channel.erase("None")
    with pytest.raises(ValueError):
        g2f.Channel(name_new)
 
    # deleting a Channel object should be fine
    del channel_new
    # ...only calling erase removes it from the registry, though
    g2f.Channel.erase(name_new)
    assert g2f.Channel.find(name_new) is None
    assert len(g2f.Channel.all) == n_channels
    assert len(g2f.Channel(name_new).all) == (n_channels + 1)
    assert len(g2f.Channel("Another unusually long name").all) == (n_channels + 2)